How severe is CVE-2021-23509?

CVE-2021-23509 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-23509 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23509?

CVE-2021-23509 affects Json-ptr Project Json-ptr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23509?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23509 published?

CVE-2021-23509 was published on 2021-11-03 and last updated on 2026-06-17.

CVE-2021-23509

CVE-2021-23509 is a medium-severity vulnerability in Json-ptr Project Json-ptr with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-843.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-843
Affected product: Json-ptr Project Json-ptr
Published: 2021-11-03
Last modified: 2026-06-17

Description

This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.

Frequently asked questions

What is CVE-2021-23509?: This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.
How severe is CVE-2021-23509?: CVE-2021-23509 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-23509 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23509?: CVE-2021-23509 affects Json-ptr Project Json-ptr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23509?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23509 published?: CVE-2021-23509 was published on 2021-11-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:json-ptr_project:json-ptr:*:*:*:*:*:*:*:*

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